短語(yǔ)詞組短語(yǔ)navigational visual aid 目視助航設(shè)施navigational lighting aid 助航燈光shipborne navigational aid 船載導(dǎo)航設(shè)備NAVAID Navigational Aid 導(dǎo)航設(shè)施Air navigational aid 助航設(shè)施nab navigational aid to bombing 轟炸導(dǎo)航設(shè)備AIRNAVAI D Air Navigational Aid 導(dǎo)航輔助設(shè)備 返回 navigational aid